I've found what happened here:
1 - I put limits and sizelimit in the end of slapd.conf. You have to put it in the global section, after schemas and before ACL's;
2 - I've tried to use this rules: limits anonymous size.soft=50 size.hard=50 limits dn.exact="cn=replicator_user,dc=domain,dc=com" size.soft=unlimited size.hard=unlimited size.unchecked=unlimited time.soft=unlimited time.hard=unlimited limits dn.exact="cn=user1,dc=domain,dc=com" size.soft=50 size.hard=100 time.soft=15 time.hard=60 limits users size.soft=50 size.hard=100 size.unchecked=32767 time.soft=15 time.hard=60 sizelimit unlimited
The "limits users" and limits dn.exact are compatibles ? I guess not.
Finally, this rules works for me:
limits anonymous size.soft=50 size.hard=50 limits dn.exact="cn=user1,dc=domain,dc=com" size.soft=50 size.hard=100 time.soft=15 time.hard=60 sizelimit unlimited
And I've removed the "limits user" of my configuration.
Thanks for help.